WO2013099351A1 - Dispositif d'affichage d'image - Google Patents

Dispositif d'affichage d'image Download PDF

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Publication number
WO2013099351A1
WO2013099351A1 PCT/JP2012/071189 JP2012071189W WO2013099351A1 WO 2013099351 A1 WO2013099351 A1 WO 2013099351A1 JP 2012071189 W JP2012071189 W JP 2012071189W WO 2013099351 A1 WO2013099351 A1 WO 2013099351A1
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WO
WIPO (PCT)
Prior art keywords
ambient illuminance
screen
lux
brightness
control function
Prior art date
Application number
PCT/JP2012/071189
Other languages
English (en)
Japanese (ja)
Inventor
岩崎　弘治
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2013099351A1 publication Critical patent/WO2013099351A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/58—Control of contrast or brightness in dependence upon ambient light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/14—Solving problems related to the presentation of information to be displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Definitions

  • the present invention relates to a video display device, and more particularly to a video display device having a function of controlling screen brightness in accordance with ambient illuminance.
  • the optimal value of the screen brightness (screen brightness) when viewing a video on a display device such as a TV changes depending on the ambient brightness (ambient illuminance). In general, it is easier to see a dark screen in a dark room, and it is easier to see a bright screen in a bright room.
  • the standard for lighting in the living room and entertainment specified by JIS is 150 to 300 lux. For example, when watching TV in a viewing environment of 200 lux based on 200 lux, the brightness of the screen Is preferably about 250 cd / m 2 .
  • the screen brightness is generally controlled in accordance with changes in ambient illuminance.
  • the ambient illuminance is simply detected and displayed steplessly. Since it is only reflected in the brightness, the screen brightness changes following the small change in ambient illuminance. From the viewpoint of the viewer (user), since the screen brightness frequently changes, there is a problem that the screen flickers and the visibility is not good.
  • FIG. 7 is a diagram showing a control function in which conventional ambient illuminance is associated with screen brightness.
  • reference numeral 101 denotes a control function.
  • the vertical axis represents screen luminance (%), and the horizontal axis represents ambient illuminance (lux: lx).
  • the control function 101 includes a dead zone region 101a in which the screen luminance does not change with respect to the ambient illuminance exceeding 300 lux, and 0 lux.
  • a monotonously increasing region 101b in which the screen luminance monotonously increases with respect to the ambient illuminance from 1 to 300 lux.
  • FIG. 8 is an enlarged view of the monotonically increasing region 101b of FIG.
  • control is performed so as not to change the screen brightness.
  • the screen brightness is controlled so as not to change.
  • the screen brightness in this case remains b2.
  • the ambient illuminance changes from 190 lux to 200 lux the amount of change is +10 lux, so that the screen luminance is also controlled so as not to change.
  • the screen brightness in this case remains b1. That is, even if the ambient illuminance after change (200 lux) is the same, the screen brightness varies depending on the ambient illuminance before change (210 lux or 190 lux).
  • the screen brightness does not change following a small change in ambient illuminance, but even if the ambient illuminance after the change is the same, the screen brightness is different. It gives a natural impression. That is, when the ambient illuminance increases from 190 lux to 200 lux and when the ambient illuminance decreases from 210 lux to 200 lux, the screen brightness differs despite the change to the same ambient illuminance (200 lux). Therefore, the viewer feels unnatural.
  • FIG. 8 of Patent Document 2 describes that the relationship between ambient illuminance and screen luminance is stepped. According to this, since the screen brightness is assigned for each step of the ambient illuminance, the screen brightness does not change following a small change in the ambient illuminance. Further, when the ambient illuminance changes, if the changed ambient illuminance is the same, the same screen luminance is assigned, so that an unnatural impression is not given to the viewer who is watching the screen.
  • an increment ⁇ Ln of screen luminance is added for each step of ambient illuminance, and this increment ⁇ Ln is set to a value smaller than a limit increment that does not feel a luminance difference.
  • the control function described in Patent Document 2 (FIG. 8)
  • it is composed of only a plurality of dead zone regions in which the screen luminance does not change with respect to the ambient illuminance. Therefore, even if the ambient illuminance changes greatly, the change in screen brightness is suppressed to a small extent, which is not desirable from the viewpoint of improving the viewer's visibility on the screen according to the ambient illuminance. For example, if you turn off the room lighting when watching a movie, etc., the ambient illuminance will change greatly, but the screen brightness will not change much, so the viewer will see a bright screen in a dark room, Visibility is poor.
  • the screen brightness is not changed with respect to a small change in ambient illuminance. If the screen brightness is changed, it is considered that both the prevention of screen flicker and the improvement of visibility can be achieved when the screen brightness is controlled according to the ambient illuminance.
  • a viewing environment for example, ambient illuminance of 200 lux
  • Patent Documents 1 and 2 do not disclose such a concept.
  • the present invention has been made in view of the above situation, and when controlling the screen brightness according to the ambient illuminance, the brightness of the screen is kept constant in the viewing environment often used by the viewer. It is an object of the present invention to provide a video display device capable of improving visibility while preventing flicker due to change.
  • a first technical means of the present invention includes an ambient illuminance detection unit that detects ambient illuminance, and a storage unit that stores a control function that associates ambient illuminance with screen luminance.
  • a screen brightness according to the ambient illuminance detected by the ambient illuminance detection unit is determined from the control function, and the video display device controls the brightness of the display screen based on the determined screen brightness.
  • the second technical means is characterized in that in the first technical means, the luminance of the display screen is controlled by the luminance of the backlight.
  • the third technical means is characterized in that, in the first or second technical means, the luminance of the display screen is controlled by a luminance gain of a video signal.
  • the fourth technical means is any one of the first to third technical means, wherein the reference ambient illuminance is a value between 0 and 300 lux.
  • the fifth technical means is any one of the first to third technical means, wherein the reference ambient illuminance is different for each image quality mode.
  • a sixth technical means includes a frequency calculation unit that calculates the frequency of ambient illuminance detected by the ambient illuminance detection unit in any one of the first to third technical means, and is calculated by the frequency calculation unit.
  • the ambient illuminance having a predetermined frequency or more is set as the reference ambient illuminance.
  • the screen brightness when the screen brightness is controlled in accordance with the ambient illuminance, the screen is used for a predetermined range of ambient illuminance including the reference ambient illuminance (for example, 200 lux) in the viewing environment often used by the viewer.
  • the reference ambient illuminance for example, 200 lux
  • the screen brightness is kept constant in the viewing environment often used by the viewer, and the brightness changes Visibility when the viewer looks at the display screen can be improved while preventing flickering.
  • FIG. 1 It is a block diagram which shows the structural example of the video display apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of the control function which matched the surrounding illumination intensity and screen brightness
  • FIG. 1 is a block diagram showing a configuration example of a video display device according to an embodiment of the present invention.
  • 1 indicates a video display device.
  • the video display device 1 includes a control unit 2 configured by a CPU and a memory for controlling the operation of the video display device 1, a tuner unit 3 that receives a digital broadcast wave, and a digital broadcast wave received by the tuner unit 3.
  • a liquid crystal panel 8 constituting the screen an ambient illuminance detection unit 9 that is a sensor for detecting the ambient illuminance of the video display device 1, and a storage unit 10 such as a non-volatile memory that stores a control function and the like described later.
  • the storage unit 10 stores a control function that associates ambient illuminance with screen brightness.
  • the control unit 2 determines the screen brightness according to the ambient illuminance detected by the ambient illuminance detection unit 9 from the control function of the storage unit 10 and controls the brightness of the display screen based on the determined screen brightness.
  • the ambient illuminance detection unit 9 is disposed near the liquid crystal panel 8 toward the viewer who views the video display device 1 and receives light from the surroundings (illumination light, natural light, etc.) irradiated on the liquid crystal panel 8. For example, it is composed of a photodiode.
  • the luminance of the display screen may be controlled by the luminance of the backlight 6 or by the luminance gain of the video signal. Alternatively, it may be controlled by both the luminance of the backlight 6 and the luminance gain of the video signal.
  • the control unit 2 determines the light emission luminance of the backlight 6 by referring to the data table of the storage unit 10 based on the screen luminance obtained from the control function. Then, the control unit 2 controls the backlight driving unit 5 so that the backlight 6 emits light with the determined emission luminance of the backlight 6.
  • the control function according to the present invention includes one or more control functions in which the screen luminance does not change with respect to a predetermined range of ambient illuminance including the reference ambient illuminance when the ambient illuminance is 0 to 300 lux and the screen luminance is less than the maximum value. It has a dead zone region and a monotonously increasing region where the screen brightness monotonously increases with respect to the ambient illuminance other than the predetermined range of ambient illuminance.
  • the monotonic increase here means a monotonic increase in a broad sense, and includes a case where it increases in fine steps.
  • FIG. 2 is a diagram illustrating an example of a control function in which ambient illuminance and screen luminance are associated with each other according to the present invention, in which 21 indicates a control function.
  • the horizontal axis represents the ambient illuminance (lux: lx).
  • the ambient illuminance in the dark room state is 0 lux
  • the ambient illuminance in the bright room state is 300 lux.
  • the vertical axis represents screen luminance (%), where the minimum value is 20% and the maximum value is 100%.
  • the control function 21 is a dead zone region 21a in which the screen luminance does not change with respect to a predetermined range of ambient illuminance including the reference ambient illuminance when the ambient illuminance is 0 to 300 lux and the screen luminance is less than the maximum value (100%). 1 and monotonously increasing regions 21b 1 and 21b 2 in which the screen luminance monotonously increases with respect to ambient illuminance other than the predetermined range of ambient illuminance. Further, the control function 21 has a dead zone region 21a 2 in which the screen luminance remains unchanged at the maximum value (100%) for ambient illuminance exceeding 300 lux.
  • the reference ambient illuminance is, for example, a value between 0 and 300 lux.
  • the reference ambient illuminance is 200 lux.
  • this 200 lux is a standard for lighting in the living room and entertainment specified by JIS. That is, in the control function 21, the range of 150 to 250 lux including 200 lux is defined as the dead zone region 21a 1 , and the other ranges are defined as the monotone increasing regions 21b 1 and 21b 2 .
  • the ambient illuminance range of the dead zone 21a 1 is defined as ⁇ 50 lux with the reference ambient illuminance as the center. That is, when the reference ambient illuminance is 200 lux, a range of ⁇ 50 lux (150 to 250 lux) centered on 200 lux is set as the dead zone region 21a 1 .
  • control unit 2 uses the control function 21 to control the screen luminance so as not to change with respect to a predetermined range of ambient illuminance (150 to 250 lux in this example) including 200 lux.
  • a predetermined range of ambient illuminance 150 to 250 lux in this example
  • the screen brightness does not change in response to small changes in ambient illuminance in a general viewing environment such as living room entertainment, entertainment, etc. Also, for example, when viewing movies, the room lights are turned off. When the ambient illuminance changes greatly as in the case of darkening, the screen brightness can be appropriately changed.
  • FIG. 3 is a diagram showing another example of the control function according to the present invention, in which 22 denotes the control function.
  • the control function 22 includes the reference ambient illuminance in the range where the ambient illuminance is 0 to 300 lux and the screen brightness is less than the maximum value (100%).
  • the control function 22 has a dead zone region 22a 2 in which the screen luminance remains unchanged at the maximum value (100%) for ambient illuminance exceeding 150 lux.
  • the reference ambient illuminance is 75 lux.
  • the 75 lux is the ambient illuminance when the viewing environment at night is taken into consideration. That is, in the control function 22, the range of 50 to 100 lux including 75 lux is defined as the dead zone region 22a 1 , and the other ranges are defined as the monotone increasing regions 22b 1 and 22b 2 . Then, the control unit 2 uses the control function 22 to control the screen brightness so as not to change with respect to a predetermined range of ambient illuminance (50 to 100 lux in this example) including 75 lux.
  • the ambient illuminance range of the dead zone 22a 1 is defined as ⁇ 25 lux with the reference ambient illuminance as the center. That is, when the reference ambient illuminance is 75 lux, a range of ⁇ 25 lux (50 to 100 lux) is set as the dead zone 22a 1 with 75 lux as the center.
  • the screen brightness does not change with a small change in ambient illuminance under a general viewing environment at night, and when the room lighting is turned off and darkened when watching movies, for example,
  • the screen brightness can be changed appropriately.
  • FIG. 4 is a diagram showing another example of the control function according to the present invention, in which 23 denotes the control function.
  • the basic idea is the same as in the examples of FIGS. 2 and 3, but the control function 23 has a reference ambient illuminance in the range where the ambient illuminance is 0 to 300 lux and the screen brightness is less than the maximum value (100%).
  • Dead zone regions 23a 1 and 23a 2 where the screen luminance does not change with respect to a predetermined range of ambient illuminance, and a monotonically increasing region 23b 1 where the screen luminance monotonously increases with respect to ambient illuminance other than the predetermined range of ambient illuminance.
  • 23b 2 and 23b 3 the control function 23 has a dead zone region 23a 3 in which the screen luminance remains unchanged at the maximum value (100%) with respect to ambient illuminance exceeding 300 lux.
  • the reference ambient illuminance is 75,200 lux. That is, in the control function 23, the range of 50 to 100 lux including 75 lux is the dead zone 23a 1 , the range of 150 to 250 lux including 200 lux is the dead zone 23a 2 , and the other ranges are monotonically increasing regions 23b 1 to 23b. 3 Then, using this control function 23, the control unit 2 uses a predetermined range of ambient illuminance (in this example, 50 to 100 lux) including 75 lux and a predetermined range of ambient illuminance (in this example, 150 to 100 lux) including 200 lux. The screen brightness is controlled so as not to change with respect to 250 lux). In this way, two or more dead zone regions may be provided.
  • the control unit 2 uses a predetermined range of ambient illuminance (in this example, 50 to 100 lux) including 75 lux and a predetermined range of ambient illuminance (in this example, 150 to 100 lux) including 200 lux.
  • the screen brightness is controlled so as not to change with
  • FIG. 5 is a diagram illustrating another example of the control function according to the present invention, in which 24 indicates a control function for standard mode, and 25 indicates a control function for movie mode.
  • 24 indicates a control function for standard mode
  • 25 indicates a control function for movie mode.
  • a general video display device one capable of setting a plurality of image quality modes for adjusting the image quality of a display video is known.
  • the mode is set in consideration of the viewing environment of the video display device, user requirements, and the like.
  • These image quality modes and the purpose of setting the modes are determined for each manufacturer of the video display device, and the names of the modes are not unified, and various mode names are used for each manufacturer. Then, the light emission luminance of the backlight light source is controlled in accordance with the image quality mode, so that an image can be displayed with an optimum brightness according to the image quality mode.
  • the reference ambient illuminance is different for each image quality mode.
  • the image quality mode includes, for example, a dynamic (storefront) mode, a standard mode, a movie mode, and a game mode.
  • the dynamic mode is a mode that is considered to be used in a bright environment such as a store or an environment where a large number of people view for demonstration purposes.
  • the standard mode is a mode set in consideration of use in a standard viewing environment such as a home living room.
  • the movie mode is a mode set for viewing movie content
  • the game mode is a mode used when the viewer plays a game.
  • the reference ambient illuminance is set to 200 lux, for example.
  • the standard mode control function 24 has a predetermined range of ambient illuminance (150 to 250 lux in this example) in a range where the ambient illuminance is 0 to 300 lux and the screen brightness is less than the maximum value (100%).
  • the standard mode control function 24 has a dead zone region 24a 2 in which the screen luminance remains unchanged at the maximum value (100%) for ambient illuminance exceeding 300 lux.
  • the reference ambient illuminance is set to 100 lux, for example.
  • the movie mode control function 25 has a dead zone region 25a 1 in which the screen luminance does not change with respect to a predetermined range of ambient illuminance (in this example, 50 to 150 lux) including 100 lux, and the screen luminance monotonously with respect to the ambient illuminance. It has monotonically increasing regions 25b 1 and 25b 2 that increase. Further, the movie mode control function 25 has a dead zone region 25a 2 in which the screen luminance remains unchanged at the maximum value (100%) for ambient illuminance exceeding 200 lux.
  • FIG. 6 is a diagram showing another example of the control function according to the present invention, in which 26 denotes the control function.
  • the left side of the vertical axis is the screen brightness (%), and the right side is the frequency (times).
  • the video display device 1 of this example includes a frequency calculation unit that calculates the frequency of ambient illuminance detected by the ambient illuminance detection unit 9.
  • This frequency calculation unit can be realized as a function of the control unit 2. And let the surrounding illuminance whose frequency calculated by the control part 2 is more than a predetermined value be a reference ambient illuminance.
  • the ambient illuminance is detected immediately after activation of the video display device 1 or when a certain time has elapsed after activation, and the frequency of the detected ambient illuminance is counted as one time. That is, every time the video display device 1 is activated, the ambient illuminance at that time is detected, and the frequency of the detected ambient illuminance is counted. Then, this process is continued for a predetermined period, for example, one month, and the frequency for each ambient illuminance for one month is calculated.
  • the predetermined value is 10 times, and the ambient illuminance with the frequency calculated by the control unit 2 of 10 times or more is set as the reference ambient illuminance. Specifically, since the ambient illuminance is 50 lux and the frequency of 175 lux is 10 times or more, these 50 lux and 175 lux are the reference ambient illuminance.
  • the control function 26 is for a predetermined range of ambient illuminance (in this example, 25 to 75 lux) including 50 lux when the ambient illuminance is 0 to 300 lux and the screen brightness is less than the maximum value (100%). It has a dead zone region 26a 1 in which the screen luminance does not change.
  • control function 26 sets the dead zone area 26a 2 in which the screen luminance does not change with respect to a predetermined range of ambient illuminance including 175 lux (125 to 225 lux in this example), and ambient illuminance other than the predetermined range of ambient illuminance.
  • it has monotonically increasing regions 26b 1 , 26b 2 , 26b 3 in which the screen brightness monotonously increases.
  • control function 26 has a dead zone region 26a 3 in which the screen luminance remains unchanged at the maximum value (100%) for ambient illuminance exceeding 300 lux.
  • the frequency of ambient illuminance when the viewer actually views the video display device 1 is calculated, and the frequently used ambient illuminance is set as the reference ambient illuminance, which matches the actual usage of the viewer.
  • a dead zone region can be set for a predetermined range of ambient illuminance including ambient illuminance.
  • SYMBOLS 1 Video display apparatus, 2 ... Control part, 3 ... Tuner part, 4 ... Video signal processing part, 5 ... Backlight drive part, 6 ... Backlight, 7 ... Liquid crystal panel drive part, 8 ... Liquid crystal panel, 9 ... Ambient Illuminance detection unit, 10 ... storage unit, 21 to 23, 26 ... control function, 24 ... standard mode control function, 25 ... movie mode control function.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Physics & Mathematics (AREA)
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  • Business, Economics & Management (AREA)
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  • Computer Hardware Design (AREA)
  • Environmental Sciences (AREA)
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  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Television Receiver Circuits (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention a pour objet, lors d'une commande de luminosité d'écran en fonction d'un éclairage ambiant, de maintenir constante la luminosité de l'écran dans un environnement de visualisation habituel pour un observateur de manière à éviter une oscillation due à des variations de la luminosité et à améliorer la visibilité. Le dispositif d'affichage d'image d'après la présente invention comprend une unité de détection de l'éclairage ambiant qui détecte l'éclairage ambiant, une unité de mémoire qui mémorise une fonction de commande (21) qui établit une correspondance entre l'éclairage ambiant et la luminosité de l'écran, une unité de commande qui détermine la luminosité de l'écran correspondant à l'éclairage ambiant détecté par l'unité de détection de l'éclairage ambiant à partir de la fonction de commande (21) et commande la luminosité de l'écran d'affichage sur la base de la luminosité de l'écran qui a été déterminée. La fonction de commande (21) comporte une région de zone morte (21a1) dans laquelle la luminosité de l'écran ne varie pas en fonction de l'éclairage ambiant (150 à 250 lux) dans une plage prescrite qui contient un éclairage ambiant de référence (200 lux), qui se situe dans une plage dans laquelle l'éclairage ambiant est compris entre 0 et 300 lux et la luminosité de l'écran est inférieure à une valeur maximum (100 %), ainsi que des régions de croissance monotone (21b1, 21b2) dans lesquelles la luminosité de l'écran croît de manière monotone par rapport à l'éclairage ambiant, en dehors de l'éclairage ambiant de la plage prescrite.
PCT/JP2012/071189 2011-12-26 2012-08-22 Dispositif d'affichage d'image WO2013099351A1 (fr)

Applications Claiming Priority (2)

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JP2011-283048 2011-12-26
JP2011283048A JP5318937B2 (ja) 2011-12-26 2011-12-26 映像表示装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018150602A1 (fr) * 2017-02-14 2018-08-23 Eizo株式会社 Dispositif d'affichage, programme et procédé d'affichage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105208191B (zh) * 2015-08-13 2019-02-12 小米科技有限责任公司 模式切换方法及装置

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